Screw fastener



FIG. 1 is a bottom perspective view of a screw fastener of our new design.

FIG. 2 is a top perspective view of the screw fastener of FIG. 1.

FIG. 3 is a front view of the screw fastener of FIG. 1.

FIG. 4 is a left side view of the screw fastener of FIG. 1.

FIG. 5 is a right side view of the screw fastener of FIG. 1.

FIG. 6 is a top plan view of the screw fastener of FIG. 1; and,

FIG. 7 is a bottom plan view of the screw fastener of FIG. 1.

The broken lines in the drawings illustrate portions of the screw fastener and form no part of the claimed design. 

CLAIM The ornamental design for a screw fastener, as shown and described. 